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My objective is to identify the USB device and need to launch the USB authentication application which will open the USB drive/partition.  So I am registering the USB arrival and removal in the init()  See below functions.

- ( id )init

{

    [super init];

    // Register ourself for callbacks when the devices we want

    // to know about come online/leave

    

    deviceNotifyPort = MACH_PORT_NULL;

    deviceAppearedIterator = 0;

    deviceDisappearedIterator = 0;

    [self registerDeviceCallbackHandler ];

    return self;

}

- ( void ) registerDeviceCallbackHandler

{

    mach_port_t masterPort;

    CFRunLoopRef runLoop;

    CFDictionaryRef classToMatch;

    CFRunLoopSourceRef runLoopSource;

    // Get a handle to the master port for IOKit

    if ( KERN_SUCCESS != IOMasterPort( MACH_PORT_NULL, &masterPort) )

    {

        return;

    }

    // Create the port on which we will receive notifications. We'll wrap it in a runLoopSource

    // which we then feed into the runLoop for async event notifications.

    deviceNotifyPort = IONotificationPortCreate ( masterPort );

    if ( deviceNotifyPort == NULL )

    {

        mach_port_deallocate ( mach_task_self ( ), masterPort );

        return;

    }

    // Get a runLoopSource for our mach port.

    runLoopSource = IONotificationPortGetRunLoopSource ( deviceNotifyPort );

    classToMatch = IOServiceMatching( kOnSpecCDDriverIOKitClassName);

    if ( classToMatch == NULL )

    {

        return;

    }

    // Retain a reference since we arm both the appearance and disappearance notifications

    // and the call to IOServiceAddMatchingNotification() consumes a reference each time.

    classToMatch = ( CFMutableDictionaryRef ) CFRetain ( classToMatch );

    IOServiceAddMatchingNotification ( deviceNotifyPort,

kIOFirstMatchNotification ,

classToMatch,

AppearedNotificationHandler,

( void * ) self ,

&deviceAppearedIterator );

        // Since we got back an iterator already from this routine, we call the handler to immediately

        // dispatch any devices there already

    AppearedNotificationHandler( (void *) self, deviceAppearedIterator);

    

    IOServiceAddMatchingNotification ( deviceNotifyPort,

                                                                                kIOTerminatedNotification,

                                                                                classToMatch,

                                                                                DisappearedNotificationHandler,

                                                                                ( void * ) self,

                                                                                &deviceDisappearedIterator );

    // Since we got back an iterator already from this routine, we call the handler to immediately

    // dispatch any devices removed already

    DisappearedNotificationHandler( (void *) self, deviceDisappearedIterator );

    // Get our runLoop

    runLoop = [ [ NSRunLoop currentRunLoop ] getCFRunLoop ];

    // Add our runLoopSource to our runLoop

    CFRunLoopAddSource ( runLoop, runLoopSource, kCFRunLoopDefaultMode );

    // Deallocate the masterPort we allocated

    mach_port_deallocate ( mach_task_self ( ), masterPort );

return;

}

--
Elango C
CompuApps, Inc.
Chennai, India.
website:http://celango.blogspot.com

"Obstacles are those frightful things you see
when you take your eyes off your goal."

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